Anti-biofilm performance of three natural products against initial bacterial attachment

Maria Salta, Julian Wharton, Simon Dennington, Paul Stoodley, Keith Stokes

Research output: Contribution to journalArticlepeer-review


Marine bacteria contribute significantly towards the fouling consortium, both directly (modern foul release coatings fail to prevent “slime” attachment) and indirectly (biofilms often excrete chemical cues that attract macrofouling settlement). This study assessed the natural product anti-biofilm performance of an extract of the seaweed, Chondrus crispus, and two isolated compounds from terrestrial sources, (+)-usnic acid and juglone, against two marine biofilm forming bacteria, Cobetia marina and Marinobacter hydrocarbonoclasticus. Bioassays were developed using quantitative imaging and fluorescent labelling to test the natural products over a range of concentrations against initial bacterial attachment. All natural products affected bacterial attachment; however, juglone demonstrated the best anti-biofilm performance against both bacterial species at a concentration range between 5–20 ppm. In addition, for the first time, a dose-dependent inhibition (hormetic) response was observed for natural products against marine biofilm forming bacteria.
Original languageEnglish
Pages (from-to)21757-21780
JournalInternational Journal of Molecular Sciences
Issue number11
Early online date4 Nov 2013
Publication statusPublished - Nov 2013
Externally publishedYes


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